Grate bar



Sept. 30, 1941. c. v. THORSELL GRATE BAR Filed June 1, 1939 INVENTORCARL V, 77/0R5ELL.

Patented Sept. 30, 1941 UNITED STATES PATENT OFFICE 7 Carl V.ThorsellQWest Hempstead, N. Y., assignor r to Combustion EngineeringCompany,- Inc.,

New York, N. Y.

Application June 1, 1939, Serial No. 276,760

3 Claims.

The present invention relates to improvements in that type of grate barhaving passages therein for the flow of air into a chamber below thegrate bars and thence up between adjacent bars into the fuel.

Grate bars of this type are hollow so that air may enter a bar at oneend from a primary air chamber and flow through a passage extendinglongitudinally of the bar to a secondary air chamber and thence upwardlybetween adjacent bars into the fuel carried by the bars. To provide thecirculation of air the bar is provided on its under side with an openingnear the head or retort end of the bar communicating with the primarychamber and a similar opening at the toe end of the bar in communicationwith the secondary air chamber, these openings communicating with thelongitudinal air passage in the bar. An object of the present inventionis to provide means for regulating the flow of air through the interiorof the bar and directing it against the toe of the bar to cool thelatter.

In the rawing, Fig. 1 is a longitudinal sectional view through part of astoker provided with grate bars embodying the present invention; and

Fig. 2 is a sectional view on the line 22 of Fig. 1.

In Fig. 1 the numeral 10 designates a wall of the retort of a stokerfurnace and H the outer wall of a secondary air chamber located beneaththe grate. The intermediate partition l2 separates the primary airchamber l3 from the secondary air chamber I4. The grate bars I5 restupon the walls l and H closing the top of the air chambers. Alternatebars are reciprocable and a rocker bar l6 extending transversely of thegrate has a flange or key I! engageable between the lugs IE on thereciprocable bars for rocking them to feed the fuel away from theretort.

As mentioned above the grate bar I is hollow and has an air passage 20extending longitudinally of the bar, the passage being defined by thetop wall 21, bottom wall 22 and the side walls 23 of the bar. In thebottom Wall 22 near the head end of the bar is an opening 24 placingpassage 20 in communication with the primary air chamber l3 while at thetoe end of the bar the bottom wall 22 is formed with an opening 25placing passage 20 in communication with the secondary air chamber 14.Air supplied to the primary air chamber l3 flows through the opening 24along the passage 20 in the bar and out through the opening 25 into thesecondary air chamber [4 and thence upwardly between adjacent bars tothe fuel bed. Some of the air may also pass through openings 26 and 21in the end and top wall of the bar near the head thereof.

Mounted on the bottom wall 22 of the bar at or adjacent the rear edge ofair outlet 25 near the toe end is a baffle plate 30 extending upwardlyinto the air passage 20. The baflle plate Ellis inclined forwardlytoward the toe of the bar and extends across the air stream passingthrough passage so as to direct air against the inner wall or toe of thebar to maintain it cool. Baffle plate 38 is provided with an elongatedslot 3! so that it may be adjustably mounted on a bolt 32 carried on thebottom wall of the bar and held in place by a nut 33. This mounting ofthe bafile permits it to be adjusted so that it may be projected intothe air passage 20 to the extent desired to provide for cooling of thetoe of the bar. Baflle plate 30 may also be adjusted to restrict theefiective area of outlet and thus regulate the flow of air from the airpassage 23 acting as a sort of dam, and forcing more air to pass throughthe openings 26 and 21 at the head of the bar.

It is understood that the rocker bar I6 and flange or key I! and thelugs l8 on the reciprocable bars may be located near the toe end of thegrate bar I5 and that air chamber M might be the primary air chamber andair chamber 53 the secondary air chamber. The air would then flow fromchamber l4 through opening 25, be directed into the toe of grate bar 15by damper and flow thence through bar passage 20 and downwardly throughopening 24 into secondary air chamber i3 and up between adjacent bars.Some of the air would pass out through openings 26 and 27.

What I claim is:

1. In a grate bar having a longitudinal air passage defined by the top,side and bottom walls of the bar and extending from its head end to itstoe end with openings in said bottom wall adjacent the head and toe ofthe bar for placing said passage in communication with air compartmentsof a stoker so that air may flow through the bar from its head end toits toe end; a bafile plate extending into and across said air passagefrom thelower wall of said bar near the rear edge of the air openingadjacent the toe of the bar and inclined toward said toe for directingair flowing along said passage against said toe.

2. In a grate bar having a longitudinal air passage defined by the top,side and bottom walls the toe of the bar and inclined toward said toe 10for directing air flowing along said passaf-imv against'said toe; andmeans for adjustably supporting said battle on said bottom wall of saidbar.

3. In a grate bar having a longitudinal air 15 passage defined by thetop, side and bottom walls 7 of the bar and extending from its head endto its,

toe end with openings in said bottom wall adjacent the head and toe ofthe bar for placing said passage in communication with air compartmentsof a stoker so that air may flow from the head to the toe end of thebar; a movable baflle plate extending upwardly from the bottom wall ofsaid bar into said air passage from a point adjacent the rear edge ofthe air opening at the toe end of said bar and inclined towards said toefor directing air against the internal Wall of said toe; and means foradjustably supporting said baflle plate on said bottom Wall.

' CARL V. THORSELL.

